Line of Sight Link Budget Analysis in High-Speed Wireless Design

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Added on 2024/06/28

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This assignment focuses on designing a high-speed wireless data link using line of sight link budget analysis. It begins by calculating the Free Space Path Loss (FSPL) for frequencies of 2.4GHz and 5.8GHz at distances of 5Kms and 10Kms, providing a comparative analysis. Subsequently, it determines the received power and link margin given specific parameters like transmission power, antenna gain, receiver sensitivity, frequency, and distance. Finally, the assignment calculates the time availability based on the link margin, demonstrating how different link margins correspond to varying levels of time availability. Desklib provides access to similar solved assignments and resources for students.

Designing a High-speed Wireless Data
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Line of Sight Link Budget Analysis
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Contents
(a)..................................................................................................................................................... 2
(b).....................................................................................................................................................3
(c)..................................................................................................................................................... 4
1

(a)
FSPL stands for the free space path loss. The standardized unit for FSPL is dB.
The generalized formula for FSPL is
FSPL (in dB) = 20log (d) +20log (f) +32.44
Where,
d stands for the distance between transmitter and receiver (kms)
f stands for the frequency of signal (MHz).
Given data:
 Frequency1 =2.4GHz
 Frequency2 = 5.8GHz
 Distance1 = 5Kms
 Distance2 = 10Kms
Calculation for 2.4GHz at 5Kms, 10Kms
20log5+20log2.4+32.44=54.02dB
20log10+20log2.4+32.44+60.04dB
Calculation for 5.8GHz at 5Kms, 10Kms
20log5+20log5.8+32.44=61.69dB
20log10+20log5.8+32.44+67.71dB
2
Frequency 2.4 Frequency 5.8
Distance 5 54.02 61.69
Distance 10 60.04 67.71

(b)
Given information:
 Frequency(f)= 5.8GHz
 Distance(d)= 5Km
 Transmission power (Tx)=23dB
 Gain of antenna = 24dB
 Sensitivity of receiver = -72dBm.
Assume loss should be negligible for connectors:
Power received(dBm)=transmission power+gain of transmitting antenna+gain of received
antenna-FSPL
In previous solution, FSPL is generated by formula:
FSPL(dB)=10log10(4*3.14*d*f/c)2
Substitute the values in formula
FSPL(dB)=10log10[4*3.14*5*1000*5.8*108/3*108]
FSPL=121.70
On substituting value of FSPL in the formula of received power:
Power received=23+24+24-121.70=-50.70
Now, link margin can be calculated as,
Link margin=power received-received sensitivity
=-50.75-(-72)
=-50.75+82 = 21.30
3

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(c)
Now, calculate the time availability,
Availability of time = 99% for the value of link margin is 18
Availability of time = 99.9% for the value of link margin is 28
The generated link margin is 21.3dBm
The required time availability is 99-99.9%
=99.35%
4